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Search Results: 1 - 10 of 2910 matches for " intra ocular lens (IOL) "
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Estimation of mean ND: Yag laser capsulotomy energy levels for membranous and fibrous posterior capsular opacification
R Bhargava,P Kumar,A Prakash,KP Chaudhary
Nepalese Journal of Ophthalmology , 2012, DOI: 10.3126/nepjoph.v4i1.5861
Abstract: Introduction: Posterior capsule opacification (PCO) is a visually-disabling complication of cataract surgery. Objective: To estimate energy levels for capsulotomy in various subtypes of PCO (membranous, fibrous and fibro-membranous). Materials and methods: A total of 215 patients with PCO were randomly selected and evaluated for Nd: Yag laser capsulotomy, after a quiet post-operative course of 3 months. The ocular area was arbitrarily divided into three zones: YAG zone (3mm), Optical zone (6 mm) and the peripheral zone (12mm). A colour code was assigned to the subtype of PCO in these zones: fibrous green and membranous blue. The type of PCO in each quadrant of YAG zone was estimated in percentage. Results: The statistic mean values of initial energy levels were 1.80 mJ for membranous PCO, 3.17 mJ for fibrous PCO and 2.73 mJ for fibro-membranous PCO. The mean summated energy levels for membranous PCO was 22.80 mJ for membranous PCO, 80.06 mJ for fibrous PCO and 80.48 mJ for fibro-membranous type. Conclusion: Colour coding is extremely helpful for quantification of the type of PCO and in deciding the initial energy level necessary to create capsulotomy. Fibro-membranous PCO required more summated energy despite a lower starting energy. Therefore, we recommend firing the initial shot in fibrous portion in case of fibrous-membranous type of PCO. DOI: http://dx.doi.org/10.3126/nepjoph.v4i1.5861 NEPJOPH 2012; 4(1): 108-113
Refractive and visual outcome of toric intraocular lens implantation following cataract surgery
JB Ale,J Power,K Zohs,F Cunningham
Nepalese Journal of Ophthalmology , 2012, DOI: 10.3126/nepjoph.v4i1.5848
Abstract: Purpose : To evaluate the refractive and visual outcome of toric IOL implantation for correction of pre-existing corneal astigmatism following cataract surgery. Materials and methods: In this retrospective study, 56 eyes of 30 patients who underwent implantation of toric IOL following regular phacoemulsification were divided into two groups based on the types of toric IOL implanted: group 1 patients received Acrysof toric (Alcon) and group 2 patients received AT-Torbi (Zeiss Meditech) IOLs. Pre-and post-operative corneal and refractive astigmatisms, and post-operative distance vision were investigated. Statistical analysis was carried out using the paired student t-test when necessary. Factors affecting the success of toric IOL implantation are discussed and recommendations are made to optimize the outcome. Results : The mean age of all patients was 75.56 ± 9.87 years. No statistical difference was observed between pre-and post-operative corneal astigmatism (p = 0.819). Postoperative refractive astigmatism was significantly less in both groups (Group 1: p = 0.0014; Group 2: p=<0.00001). The best-corrected distance visual acuity was 6/12 or better in 95 % of group 1 and 100 % of group 2 patients. Conclusion : Toric IOL implantation is a viable and highly predictable method of correcting the corneal astigmatism. It allows correction without compromising the integrity of the cornea. Careful selection of the patient, accurate keratometry and precise alignment of the cylindrical axes are some of the factors to be considered for a superior outcome. DOI: http://dx.doi.org/10.3126/nepjoph.v4i1.5848 NEPJOPH 2012; 4(1): 37-44
Y-Shaped Intra-Scleral Fixated Lens versus Retro-Pupillary Iris Claw Lens in the Treatment of Aphakia  [PDF]
Ahmed Mohamed Morshed, Mahmoud Nasr Aldeeb, Adel Kamal Abdeen, Salah Mohamed Almosalamy
Open Journal of Ophthalmology (OJOph) , 2019, DOI: 10.4236/ojoph.2019.92012
Abstract: Background: Many reasons can lead to an aphakia without adequate capsular support for implantation of a posterior chamber intraocular lens (IOL), such as intraoperative unintentional rupture of posterior capsule during phacoemulsification, planned intracapsular cataract extraction, ocular trauma and lens dislocation due to congenital and acquired causes. Purpose: To compare Y-shaped intra-scleral fixation of a posterior chamber IOL with retro pupillary fixation of an iris-claw intraocular lens (IOL) for Aphakic eyes without sufficient capsular support as respects safety, visual recovery and complications of both methods. Patients and Methods: One hundred Aphakic eyes were arbitrarily distributed between two groups. Group A included 50 eyes treated with retropupillary fixation of iris claw lens and group B included 50 eyes treated with Y-shaped intra-scleral fixation technique. Preoperative, intraoperative and postoperative data were analysed including best corrected visual acuity (BCVA), intraocular pressure (IOP), surgical time, intraoperative problems, IOL malposition and postoperative complications. Following up on patients was carried out for at least six months. Results: The mean duration of surgery was 21 ± 5.3 min in group A and was 53.4 ± 6.9 min in group B (p-value < 0.001). After 6 months, the mean BCVA was 0.34 ± 0.15 in group A and was 0.31 ± 0.16 in group B (p > 0.05). IOL tilt was found in 0 (0%) eyes in group A and in 5 (10%) eyes in group B (p < 0.05). IOL decentration was observed in 1 (2%) eye in group A and 7 (14%) eyes in group B, with statistically significant difference (p value = 0.03). Cystoid macular edema was found in 2 (4%) eyes in group A and in 5 (10%) eyes in group B (p > 0.05). Conclusion: The results of our study indicated that both methods are satisfactory in correcting aphakia without sufficient capsular support as regards postoperative best corrected visual acuity (BCVA); however the surgical technique of retropupillary iris claw lens is easier, shorter, with low intra- and postoperative complications and safer than those used for intra-scleral fixation of IOL. But for eyes which lack both iris and capsular support, a scleral fixation of a posterior chamber IOL remains the only option.
Estudo prospectivo comparativo de duas técnicas cirúrgicas de extra??o extra-capsular planejada de catarata com implante de lente intra-ocular: incis?o limbar e incis?o escleral tunelizada
Freitas, Lincoln Lemes;Di Martino, Daniel Sánchez;Mori, Edson;Mendon?a, Marcelo;Casanova, Fábio Henrique Cacho;Abreu, Mariza Toledo de;
Arquivos Brasileiros de Oftalmologia , 2001, DOI: 10.1590/S0004-27492001000300015
Abstract: purpose: cataract is the main cause of blindness throughout the world, affecting more than 15 million people worldwide. there are different techniques for extracapsular cataract extraction (ecce) with posterior chamber intraocular lens implantation. this study aims to compare limbal incision and scleral tunnel incision in planned ecce. methods: fifty-four consecutive patients (59 eyes) with follow-up of 6 months were studied prospectively. ecce with limbal incision was performed in 30 patients (group i), and with scleral tunnel incision in 29 patients (group ii). corrected visual acuity, intraocular inflammation (cells and flare), surgical time, specular microscopy, induced astigmatism and pachymetry were assessed. results: surgical time, endothelial cells loss and induced astigmatism were statistically greater in group i than in group ii. no significant differences were found between groups when comparing the corrected visual acuity, intraocular inflammation and pachymetry. conclusions: ecce with scleral tunnel incision technique offers advantages regarding surgical time, endothelial cells loss and induced astigmatism if compared with limbal incision technique. surgical steps used in this technique help in transition for phacoemulsification with low cost and a safer way.
Cataract surgery in children: Controversies and practices
UD Shrestha
Nepalese Journal of Ophthalmology , 2012, DOI: 10.3126/nepjoph.v4i1.5866
Abstract: Pediatric cataract is totally different from adult cataract. The objective of this review article is to describe the peculiarities of pediatric cataract and the controversies and practices in pediatric cataract surgery. The differences in the surgical technique are discussed in the article. There are lots of controversies regarding IOL implantation in children. The result of the review is that the pediatric cataract surgery should be performed in between 6-8 weeks of age. There is no contra-indication for IOL implantation. Surgeons can implant either polymethylmethacrylate (PMMA) or Acrysoft foldable IOL. DOI: http://dx.doi.org/10.3126/nepjoph.v4i1.5866 NEPJOPH 2012; 4(1): 138-149
Opacifica??o tardia de lente intra-ocular de polimetilmetacrilato (PMMA): relato de caso
Maia Júnior, Otacílio de Oliveira;Nakashima, Aloísio Fumio;Barbosa, Eduardo Parente;Primiano Júnior, Hélio Paulo;Nakashima, Yoshitaka;
Arquivos Brasileiros de Oftalmologia , 2005, DOI: 10.1590/S0004-27492005000500021
Abstract: the use of intraocular lenses was a great advance in visual recovery after cataract surgery. although usually with good biocompatibility, some alterations in the intraocular lens material may occur after implantation. polymethylmethacrylate was the first intraocular lens material to be used on a large scale and assumed to be inert and well-tolerated. we present a rare case of late opacification of a polymethylmethacrylate lens, discussing important aspects of its management such as the indication for intraocular lens exchange.
Evaluación del equipo de interferometría óptica de coherencia parcial Lenstar en la biometría ocular
Miranda Hernández,Iramis; Hernández Silva,Juan Raúl; Rio Torres,Marcelino; Ruiz Rodríguez,Yanele; Del Amo Freire,Jenny; Bisnubia Vargas,Acelia;
Revista Cubana de Oftalmolog?-a , 2010,
Abstract: objectives: to compare and to evaluate the ocular biometry taken by a new optical partial coherence interferometry device (lenstar),the low coherence optical interferometry equipment (ilo master) and the topographic systems pentacam y galilei. methods: a descriptive cross-sectional study was conducted in 120 eyes from 60 patients. for the iol calculation, the necessary measurements were taken with the new optical biometer lenstar ls 900 (haig streit ag) and with the iol master v5 (carl zeiss meditec ag). the results were evaluated using the linear regression analysis and pearson′s correlation. the measures were then compared to those taken by topographic devices galilei and pentacam. results: there existed high correlation in biometric measurements of axial length, keratometry and anterior chamber depth between the lenstar and the iol master. good correlation was also found for the keratometry and anterior chamber depth between the lenstar and the topographs pentacam and galilei. conclusion: the new biometer lenstar provided results that correlated very well with those of the iol master, pentacam and galilei systems. lenstar is a precise device offering additional features that will be helpful for any cataract or refractive surgery.
New Technologies of a Lens Refractive Substitution with a Use of Microincisions
I.G. Smetankin
Sovremennye Tehnologii v Medicine , 2010,
Abstract: Materials and methods. The operations on a lens refractive substitution were made on 67 eyes of patients at the age of 27—84 years. A bimanual extracapsular phacoaspiration with an artificial lens implantation is made on 24 eyes; a bimanual extracapsular phacoethmulsification is made on 43 eyes. The operations are made according to the methods proposed by authors. A maximum date of observation was 5 years.Results and discussion. A remote postoperative period was smooth in more than 95% of the treated patients due to the thorough atraumatic operations. Practically all the rare complications of a postoperative period were conservatively cupped. A visual acuity of 0.7 and more is achieved in 80.6% of patients. The proposed methods with a use of a minimum power and exposition of ultrasound in a zone of the greatest distance both from a posterior capsule and anterior surface of a vitreous body and the cornea endothelium minimize a risk of complications and provide the good early and remote results of operation.Conclusion. The proposed microsurgical method and instrument use permits to exclude or significantly reduce a time of the ultrasound work and a general duration of operation, to decrease its traumatism, a probability of the early and late postoperative period complications, which is favorable for postoperative recovery and rehabilitation dates.
Study of Steroid Induced Rise in Intraocular Pressure Using Non-contact Tonometer After Cataract Surgery in Camp Patients at P.D.U. Medical College Rajkot, Gujarat
Dodiya Kamal S,Aggarwal Somesh V,Bareth Kiran,Shah Nirzari
National Journal of Medical Research , 2012,
Abstract: Objectives: To study the incidence of steroid induced rise in intraocular pressure following cataract surgery using non contact tonometer. Materials and Methods: The study was undertaken in a tertiary care centre. 500 eyes which underwent uncomplicated cataract surgery were studied for IOP changes for up to six weeks following omission of steroid eye drops using non contact tonometer. Results: At the end of six weeks of steroid therapy, 21% patients had persistently raised IOP of which 2% had raised IOP at the end of six weeks following omission of steroid therapy. Conclusion: Non contact tonometry is equally effective for diagnosis and following up patients of drug (steroid) induced glaucoma. [National J of Med Res 2012; 2(2.000): 169-172]
A theoretical model of the human eye based on ultrasound and corneal data
Martin Falhar,Jiri Rehak
Optica Applicata , 2009,
Abstract: The purpose of this study was to create a theoretical model of the eye based on a comparison of the real spherical equivalent of the eye and the calculated value of the axial refraction. The main contribution of this model is that it enables calculation of the equatorial plane of the lens for accurate assessment of the IOL position for a spherical eye model. The Gullstrand model of the eye was used as the source eye model and this was modified for the purposes of this study. The axial refraction of the final model of the eye was compared with the spherical equivalent. The accuracy of the developed model was statistically confirmed using statistic tests. Individual calculation of the axial refraction using it shows that IOL calculation is possible without any general statistical presumptions. It permits the calculation of variables with an accuracy accepted by inferential statistics. The accuracy of this theoretical eye model however, is limited by extreme values of variables – an extreme value provides a less accurate result.
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